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Statements of Stockholders' Equity (USD $) | Total | Common Stock [Member] | Additional Paid-In Capital [Member] | Accumulated Deficit [Member] | Accumulated Other Comprehensive Income [Member]
--- | --- | --- | --- | --- | ---
Beginning Balance at Sep. 30, 2011 | $ 18,055,291 | $ 24,144 | $ 33,660,397 | $ (15,619,395) | $ (9,855)
Beginning Balance, shares at Sep. 30, 2011 |  | 24,144,366 |  |  |
Exercise of stock options | 732,287 | 1,740 | 730,547 |  |
Exercise of stock options, shares | 1,812,215 | 1,739,924 |  |  |
Exercise of warrants |  | 111 | (111) |  |
Exercise of warrants, shares |  | 110,926 |  |  |
Stock-based compensation expense | 2,599,858 |  | 2,599,858 |  |
Components of comprehensive income: |  |  |  |  |
Net loss | (7,839,996) |  |  | (7,839,996) |
Change in unrealized gain (loss) on investments | 9,239 |  |  |  | 9,239
Total comprehensive loss | (7,830,757) |  |  |  |
Ending Balance at Sep. 30, 2012 | 13,556,679 | 25,995 | 36,990,691 | (23,459,391) | (616)
Ending Balance, shares at Sep. 30, 2012 |  | 25,995,216 |  |  |
Issuance of common stock, net of issuance costs | 16,004,797 | 3,286 | 16,001,511 |  |
Issuance of common stock, shares |  | 3,285,713 |  |  |
Exercise of stock options | 714,469 | 1,043 | 713,426 |  |
Exercise of stock options, shares | 1,103,582 | 1,042,872 |  |  |
Settlement of restricted stock units | (65,813) | 37 | (65,850) |  |
Settlement of restricted stock units, shares |  | 37,641 |  |  |
Stock-based compensation expense | 2,791,862 |  | 2,791,862 |  |
Components of comprehensive income: |  |  |  |  |
Net loss | (7,275,706) |  |  | (7,275,706) |
Change in unrealized gain (loss) on investments | 2,454 |  |  |  | 2,454
Total comprehensive loss | (7,273,252) |  |  |  |
Ending Balance at Sep. 30, 2013 | 25,728,742 | 30,361 | 56,431,640 | (30,735,097) | 1,838
Ending Balance, shares at Sep. 30, 2013 | 30,361,442 | 30,361,442 |  |  |
Exercise of stock options | 118,754 | 105 | 118,649 |  |
Exercise of stock options, shares | 108,135 | 105,280 |  |  |
Settlement of restricted stock units | (48,426) | 55 | (48,481) |  |
Settlement of restricted stock units, shares |  | 54,358 |  |  |
Stock-based compensation expense | 3,444,480 |  | 3,444,480 |  |
Components of comprehensive income: |  |  |  |  |
Net loss | (5,291,869) |  |  | (5,291,869) |
Change in unrealized gain (loss) on investments | (9,648) |  |  |  | (9,648)
Total comprehensive loss | (5,301,517) |  |  |  |
Ending Balance at Sep. 30, 2014 | $ 23,942,033 | $ 30,521 | $ 59,946,288 | $ (36,026,966) | $ (7,810)
Ending Balance, shares at Sep. 30, 2014 | 30,521,080 | 30,521,080 |  |  |

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